Search for the $C\!P$-violating strong decays $η→ π^+π^-$ and $η^′(958) → π^+π^-$ (Physics Letters B, 2016)

(untitled) - Aaij, R; Adeva, B; Adinolfi, M; Cheung, S; Evans, T; Gandini, P; Cazon, B; Hadavizadeh, T; Harnew, N; Hill, D; Hussain, N; Jalocha, J; et al.